御子

From Old Japanese 御 (み) (mi, “spirit, god”) + 子 (こ) (ko, “boy, child”)

御子 (hiragana みこ, rōmaji miko)

1. A god's or spirit's child.
2. An emperor's child.
3. Jesus Christ.

From 御 (お) (o, honorific prefix) + Old Japanese 子 (こ) (ko, “boy, child”)

御子 (hiragana おこ, rōmaji oko)

1. (honorific) A child; especially the addressee's child.
   • 　御子様ランチ (okosama ranchi, "child's lunch")

• More often the first element is written in hiragana, as お子.